Product Description
Custom Autosound USA-740 IN DASH AM/FM for GMC Sprint
It is not hard to do
Your classic GM Sprint will never be the same once you install the Custom Autosound USA-740 in its dashboard. After you get a look at all the USA-740 has built into its chassis you will see that your audio experience has been taken to a new level.
There is so many components built into the Custom Autosound USA-740 that it is going to be difficult to mention them all here. It is also hard to know where to start but one thing is for sure, your audio will never b the same because you can have it your way.
The radio to end all radios
To start its RDS tuner displays the artists name and song title when it airs. With its 4 way fader, US, RU, JP, and EUR, you have access to a lot more audio options than ever before. The powerful antenna captures all the signals you need and want.
On top of that, you get direct CD control and the ability to play MP3, WMA,FLAC, and WAC formats. Then 2 RCA AUX input channels makes sure you can hook up your music sources with ease. A 5 channel RCA preout component is also built in.
But that is not all. With its Bluetooth capability, you can control the 7 color LCD light show. Bright or dim doesn’t matter, you are in control. Then with the volume, bass, mid, and treble controls you can fine tune your audio and make sure it comes out your way.
Finally, the 300 watts of power and digital clock complete this ultimate [package for you.
Its your audio
So make sure you get it your way. The USA-7640 will make it happen for you. All you have to do is install it in your GM Sprint and head down the road.
USA-740 IN DASH AM/FM for GMC Sprint: Your Questions Answered
Is this radio made specifically for the GMC Sprint?
This listing is the version made for the GMC Sprint, designed to go into the original dash opening. Custom Autosound says its radios fit without altering or cutting the original dash.
Why does the order ask about factory air?
Select Yes or No under Factory Air so we send the correct setup for your GMC Sprint's dash.
What can I add to my USA-740 IN DASH AM/FM for GMC Sprint order?
You can add a front dual voice coil speaker, a rear 6x9 speaker pair (Custom Autosound 6x9 Speaker Pair and Upgraded Pioneer Speaker Pair), and a hideaway antenna right from the options above.
What do I get with the USA-740 in my GMC Sprint?
There are two auxiliary inputs, a front mini jack and a rear RCA. The AM/FM RDS tuner holds 25 presets (15 FM, 10 AM) and can auto-store the strongest stations.
Is there a CD or Bluetooth upgrade?
Check the CD options on this page, which include Single Slave CD and Bluetooth Adapter.
How does the USA-740 handle phone audio and connections?
You can pick from multiple LCD colors to match your gauges, with a dimmer, and it fully controls the optional CD-1 player. Custom Autosound rates it at 300 watts peak, and it adds hi-volt 4-channel RCA pre-outs plus a subwoofer line-out.
USA-740 specifications
- Bluetooth built in (streaming and hands-free calling)
- 300 watts peak power (45W x 4 RMS, 2-ohm stable)
- AM/FM stereo tuner
- 2 AUX inputs (3.5 mm front and RCA rear)
- USB port
- Direct control for optional CD-1
- 5-channel RCA pre-outs including subwoofer pre-out and control
- 15 FM and 10 AM presets
- 7-color LCD with dimmer; RDS station/song/artist display
- DSP EQ; auto-store presets
- Electronic tuning and volume; separate bass/treble; 4-way fader; L/R balance
- Power antenna lead; digital clock
- USA/EUR/JAP/RUS tuner capability (USA default)
- Custom Autosound 2-year manufacturer warranty
USA-740 wiring and tech tips
Use this as a head-unit reference for power, ground, antenna, speakers, and amplifier connections. Always match the printed diagram that ships with your unit if it differs.
Power and ground (typical Custom Autosound harness)
| Function | Wire color |
|---|---|
| Ignition / ACC +12V | Red |
| Battery / constant +12V | Yellow |
| Ground | Black |
| Power antenna | Blue |
Ignition and power-antenna leads are commonly fused at 1A on the harness—confirm against the guide that ships with your radio.
Speaker wiring (typical)
| Speaker | Wire color |
|---|---|
| Left front + / − | White / White-Black |
| Right front + / − | Gray / Gray-Black |
| Left rear + / − | Green / Green-Black |
| Right rear + / − | Violet (or Purple) / Violet-Black |
USA-740 extras
Expect antenna, USB, microphone (Bluetooth), CD-1, and subwoofer RCA connections in addition to front/rear line outs. Use the front 3.5 mm AUX or rear RCA AUX for wired sources.
Suggested order for a classic GMC Sprint
- Disconnect the vehicle battery before any wiring.
- Connect ground first, then constant (yellow) and ignition (red).
- Connect the antenna plug and the blue power-antenna lead if your car has a power antenna.
- Wire all four speakers, matching polarity.
- If using an amplifier, run RCA cables from the front/rear (and sub on USA-740/USA-850) pre-outs.
- Reconnect the battery and test radio, speakers, and charging system voltage.
Tech tips for classic GMC Sprint
- This radio is sold for the factory GMC Sprint opening used in classic models—do not cut a modern DIN rectangle if you want a stock look.
- A poor ground is the most common cause of whine or weak audio; scrape paint at the ground point and use a star washer.
- If AM reception is weak, check the antenna mast, cable continuity, and that the antenna plug is fully seated.
- Vintage Car Radio does not install radios. If you are not comfortable with 12V wiring, use a qualified installer.
USA-740 manuals
Download the manufacturer guide for operation, safety, and the official wiring diagram. You can also browse our full library on the Manuals page.
Vintage Car Radio does not offer installation. The manuals are for do-it-yourself reference or to share with your installer.
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
FAQ — classic GMC Sprint USA-740
Will this fit my classic GMC Sprint without cutting the dash?
It is built for the original radio opening used on classic GMC Sprint models. Compare your dash opening and bezel to the product photos. We do not modify dashes in-house.
Does this radio have Bluetooth?
Yes—Bluetooth is built into the USA-740 for streaming and hands-free calling.
Do I need an amplifier?
Many owners run speakers directly from the radio. Pre-outs are there if you want more volume or a subwoofer later.
Do you install the radio?
No. Vintage Car Radio ships the unit and documentation; installation is DIY or by a shop you choose.
What is the warranty?
Custom Autosound radios include a 2-year manufacturer warranty. See the Warranty section for details.
Need help?
Call 844-802-4499 or 574-226-6676.
Specs
Wiring / Tech Tips
Manuals
Warranty
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
